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113 条记录 (耗时 0.035 秒)

    Device and method for protecting a subterranean pipe from damage during excavation
    17.
    发明授权
    Device and method for protecting a subterranean pipe from damage during excavation 失效
    在开挖期间保护地下管道免受损坏的装置和方法

    公开(公告)号：US06691727B2

    公开(公告)日：2004-02-17

    申请号：US09874048

    申请日：2001-06-06

    申请人： Michael D. Jensen

    发明人： Michael D. Jensen

    IPC分类号： F16L500

    CPC分类号： F16L1/11 ,  Y10T137/0441 ,  Y10T137/0458 ,  Y10T137/6991 ,  Y10T137/7025

    摘要： A system and method is claimed for protecting sections of a buried utility pipe that will eventually be excavated and exposed for tapping purposes. The system includes a protective collar that is applied to the utility pipe before the utility pipe is buried. When the utility pipe is to be tapped, the utility pipe is excavated directly above the protective collar. The presence of the protective collar provides a physical barrier that prevents the utility pipe from being damaged from the excavating equipment. When the protective collar is removed, a clean, unobstructed area of utility pipe is exposed on which a tapping procedure can be performed.

    摘要翻译： 要求保护系统和方法来保护将最终被挖掘和暴露用于攻丝目的的埋地公用管道的部分。 该系统包括在公用管道埋设之前施加到公用管道上的保护套环。 当公用管道被攻丝时，公用管道直接在保护套上方挖掘出来。 保护套的存在提供了防止公用管道从挖掘设备损坏的物理障碍物。 当保护套环被拆除时，暴露出一个干净，无障碍的公用管道区域，在该区域可以执行攻丝程序。

    Polymerization catalysts and processes therefor
    19.
    发明授权
    Polymerization catalysts and processes therefor 失效
    聚合催化剂及其工艺

    公开(公告)号：US06380329B1

    公开(公告)日：2002-04-30

    申请号：US09474402

    申请日：1999-12-29

    申请人： Michael D. Jensen ,  Kenneth R. Farmer

    发明人： Michael D. Jensen ,  Kenneth R. Farmer

    IPC分类号： C08F416

    CPC分类号： B01J31/143 ,  B01J31/14 ,  B01J31/1608 ,  B01J31/1805 ,  B01J31/38 ,  B01J2531/48 ,  C08F110/02 ,  C08F210/16 ,  C08F2410/03 ,  C08F4/64072 ,  C08F2500/12 ,  C08F210/14

    摘要： A process is provided which comprises preparing heterogeneous or homogeneous catalyst systems comprising cyclodisilizane complexes of Group IV metals wherein said metal is selected from consisting of titanium, zirconium and hafnium; and a cocatalyst selected from the group consisting of methylaluminoxane and fluoro organic boron compounds and mixtures thereof. This invention also provides polymerization processes comprising contacting a mono-1-olefin, and optionally one or more higher alpha-olefins, in a reaction zone with cyclodisilizane complexes of Group IV metals catalyst systems and in the presence of a cocatalyst selected from the group consisting of aluminoxane, fluoro organic boron compounds, and mixtures thereof are provided.

    摘要翻译： 提供了一种方法，其包括制备包含第IV族金属的环二硅氮烷配合物的非均相或均相催化剂体系，其中所述金属选自钛，锆和铪; 和选自甲基铝氧烷和氟有机硼化合物及其混合物的助催化剂。 本发明还提供了聚合方法，包括使单烯烃和任选的一种或多种高级α-烯烃在反应区中与第IV族金属催化剂体系的环二硅氮烷配合物和在助催化剂存在下， 的铝氧烷，氟有机硼化合物及其混合物。